Update confirm device credentials to spec, add fingerprint

- New strings in the screen.
- New layout/style.
- Clean up internal API's around it.
- Add fingerprint support if launched from externally
- Separate theme if launched from externally
- If launched from above Keyguard, use SHOW_WHEN_LOCKED flag

Change-Id: Icdf9bf9e0506841f24e8aab5f0f1d1f4b688951f

src/com/android/settings/DevelopmentSettings.java

@@ -1610,10 +1610,8 @@ public class DevelopmentSettings extends SettingsPreferenceFragment
     }
 
     private boolean showKeyguardConfirmation(Resources resources, int requestCode) {
-        return new ChooseLockSettingsHelper(getActivity(), this)
-                .launchConfirmationActivity(requestCode,
-                        resources.getString(R.string.oem_unlock_enable_pin_prompt),
-                        resources.getString(R.string.oem_unlock_enable_pin_description));
+        return new ChooseLockSettingsHelper(getActivity(), this).launchConfirmationActivity(
+                requestCode, resources.getString(R.string.oem_unlock_enable));
     }
 
     @Override